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    <title>RGraph: HTML5 canvas graph library - bar chart documentation</title>
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        <a href="../index.html">RGraph: HTML5 canvas graph library</a>
        >
        <a href="index.html">Documentation</a>
        >
        Bar chart
    </div>

    <h1>RGraph: HTML5 canvas graph library - Bar chart documentation</h1>

    <script>
        if (document.all) {
            document.write('<div style="background-color: #fee; border: 2px dashed red; padding: 5px"><b>Important</b><br /><br /> Internet Explorer does not natively support the HTML5 canvas tag yet, so if you want to see the graphs, you can either:<ul><li>Install <a href="http://code.google.com/chrome/chromeframe/">Google Chrome Frame</a></li><li>Use ExCanvas. This is provided in the RGraph Archive.</li><li>Use another browser entirely. Your choices are Firefox 3.5+, Chrome 2+, Safari 4+ or Opera 10.5+. </li></ul></div>');
        }
    </script>

    <p>
        The bar graph, along with the line chart, is probably the most configurable of all the charts available,
        simply because it's more common, and hence, I've worked on it the most.
    </p>
    
    <p>
        The example file is <a href="../examples/bar.html">here</a>.
    </p>
    
    <pre class="code">
&lt;script&gt;
    window.onload = function ()
    {
        var data = [280,45,133,166,84,259,266,960,219,311];
    
        var bar = new RGraph.Bar('myCanvas', data);
        bar.Set('chart.labels', ['Richard', 'Alex', 'Nick', 'Scott', 'Kjnell', 'Doug', 'Charles', 'Michelle', 'Mark', 'Alison']);
        bar.Set('chart.gutter', 45);
        bar.Set('chart.background.barcolor1', 'rgba(255,255,255,1)');
        bar.Set('chart.background.barcolor2', 'rgba(255,255,255,1)');
        bar.Set('chart.background.grid', true);
        bar.Set('chart.colors', ['rgba(255,0,0,1)']);
        bar.Draw();
    }
&lt;/script&gt;
</pre>

    <h2>Available properties</h2>

    <p>
        You can use these properties to control how the bar graph apears. You can set them by using the Set() method. Eg:
    </p>
    
    <p>
        <b>myBar.Set('name', 'value');</b>
    </p>

    <!--
        <PROPERTIES>
            chart.background.barcolor1 :: The color of the background bars, (1 of 2). <br /><i>Default: white</i>
            chart.background.barcolor2 :: The color of the background bars, (2 of 2). <br /><i>Default: white</i>
            chart.background.grid :: Whether to show the background grid or not. <br /><i>Default: true</i>
            chart.background.grid.color :: The color of the background grid. <br /><i>Default: #ddd</i>
            chart.background.grid.hsize :: The horizontal background grid size. <br /><i>Default: 40</i>
            chart.background.grid.vsize :: The vertical background grid size. <br /><i>Default: 18</i>
            chart.background.grid.width :: The width that the background grid lines are. Decimals (eg 0.5) are permitted.<br /><i>Default: 1</i>
            chart.background.hbars :: An array of information stipulating horizontal coloured bars. You can use these to indicate limits. Eg: <i>myBar.Set('hbars', [[75, 10, 'yellow'], [85, 15, 'red']]);</i> This would give you two bars, one red and a lower yellow bar. The units correspond to your scale, and are the starting point and the height.<br /><i>Default: null</i>
            chart.background.grid.border :: Determines whether a border line is drawn around the grid.<br /><i>Default: true</i>
            chart.background.grid.hlines :: Determines whether to draw the horizontal grid lines.<br /><i>Default: true</i>
            chart.background.grid.vlines :: Determines whether to draw the vertical grid lines.<br /><i>Default: true</i>
            chart.strokecolor :: The color of the outline of the bars. <br /><i>Default: #666</i>
            chart.colors :: An array of the colors of the actual bars. <br /><i>Default: An array - ['rgb(0,0,255)', '#0f0', '#00f', '#ff0', '#0ff', '#0f0']</i>
            chart.hmargin :: The horizontal margin (in pixels) of the graph. <br /><i>Default: 5</i>
            chart.line :: Formerly a boolean, this now stipulates a line graph object which is to be drawn on top of the bar chart. You can see an example <a href="combine.html">here</a>.<br /><i>Default: null</i>
            chart.gutter :: The gutter of the graph. This is the area outside of the X and Y axis - where the labels go. If you're short on space for your labels, try increasing this. <br /><i>Default: 25</i>
            chart.labels :: An array of the labels to be used on the graph. <br /><i>Default: An empty array</i>
            chart.xaxispos :: The position of the X axis. This can be <i>bottom</i> or <i>center</i>. <br /><i>Default: bottom</i>
            chart.axis.color :: The color of the axes.<br /><i>Default: black</i>
            chart.text.color :: The color of the labels. <br /><i>Default: black</i>
            chart.text.size :: The size (in points) of the labels. <br /><i>Default: 10</i>
            chart.text.angle :: The angle of the horizontal text labels (at the bottom of the graph). This can be one of three values - 0, 45 or 90.<br /><i>Default: 0 (Horizontal)</i>
            chart.text.font :: The font used to render the text.<br /><i>Default: Verdana</i>
            chart.ymax :: The optional maximum Y scale value. If not specified then it will be calculated.<br /><i>Default: null (It's calculated)</i>
            chart.tooltips :: A numerically indexed array of tooltips that are shown when a bar is clicked. These can contain HTML.<br /><i>Default: An empty array</i>
            chart.grouping :: How the bars are grouped, and it should be one of: <b>grouped</b> or <b>stacked</b><br /><i>Default: grouped</i>
            chart.title :: The title of the graph, if any. <br /><i>Default: null</i>
            chart.title.color :: The color of the title.<br /> <i>Default: black</i>
            chart.title.vpos :: This allows you to completely override the vertical positioning of the title. It should be a number between 0 and 1, and is multiplied with the gutter and then used as the vertical position. It can be useful if you need to have a large gutter.<br /><i>Default: null</i>
            chart.shadow :: Whether a drop shadow is applied. <br /><i>Default: false</i>
            chart.shadow.color :: The color of the shadow. <br /><i>Default: #666</i>
            chart.shadow.offsetx :: The X offset of the shadow. <br /><i>Default: 3</i>
            chart.shadow.offsety :: The Y offset of the shadow.  <br /><i>Default: 3</i>
            chart.shadow.blur :: The severity of the shadow blurring effect. <br /><i>Default: 3</i>
            chart.scale.decimals :: The number of decimal places to display for the Y scale.<br /><i>Default: 0</i>
            chart.key :: An array of key information. <br /><i>Default: [] (An empty array)</i>
            chart.key.background :: The colour of the key background. Typically white, you could set this to something like rgba(255,255,255,0.7) to allow people to see things behind it.<br /><i>Default: white</i>
            chart.key.position :: Determines the position of the key.Either <b>graph</b> (default), or <b>gutter</b>.<br /><i>Default: graph</i>
            chart.key.shadow :: Whether a small drop shadow is applied to the key.<br /><i>Default: false</i>
            chart.contextmenu :: An array of context menu items. More information on context menus is <a href="context.html">here</a>.<br /><i>Default: [] (An empty array)</i>
            chart.units.pre :: The units that the Y axis is measured in. This string is displayed BEFORE the actual number, allowing you to specify values such as "$50".<br /><i>Default: none</i>
            chart.units.post :: The units that the Y axis is measured in. This string is displayed AFTER the actual number, allowing you to specify values such as "50ms".<br /><i>Default: none</i>
            chart.tooltip.effect :: The animated effect used for showing tooltips. Can be either <i>fade</i> or <i>expand</i>.<br /><i>Default: fade</i>
            chart.variant :: This simply stipulates whether you want a regular bar chart, a dot chart, a pyramid chart a 3D chart, a sketch or a glassy chart. Possible values are:<ul><li>bar</li><li>dot</li><li>pyramid</li><li>arrow</li><li>3d</li><li>sketch</li><li>glass</li></ul>The pyramid, dot, arrow, sketch and glass variants are only effective for regular bar charts - not grouped or stacked charts.<br /><i>Default: bar</i>
            chart.crosshairs :: If true, you will get a crosshair centering on the current mouse position.<br /><i>Default: false</i>
            chart.crosshairs.color :: The color of the crosshairs.<br /><i>Default: #333</i>
            chart.annotatable :: Whether annotations are enabled for the chart (ie you can draw on the chart interactively.<br /><i>Default: false</i>
            chart.annotate.color :: If you do not allow the use of the palette, then this will be the only colour allowed for annotations.<br /><i>Default: black</i>
            chart.labels.above :: If true, values will be shown above the bars. For regular and stacked bar charts units are included, whereas for grouped bar charts they're not (usually there isn't enough space for them).<br /><i>Default: false</i>
            chart.ylabels :: Can be <i>true</i> or <i>false</i> and determines whether the chart has Y axis labels.<br /><i>Default: true</i>
            chart.ylabels.count :: A value (<i>1, 3 or 5</i>) that controls how many Y labels there are. <br /><i>Default: 5</i>
            chart.zoom.mode :: Can be used to control whether the zoom is in thumbnail or canvas mode. Possible values are: <i>thumbnail</i> and <i>canvas</i>.<br /><i>Default: canvas</i>
            chart.zoom.factor :: This is the factor that the graph will be zoomed by (bigger values means more zoom)<br /><i>Default: 1.5</i>
            chart.zoom.fade.in :: Whether the zoomed canvas fades in or not. This also can be used to control the fade in for the zoom in thumbnail mode.<br /><i>Default: true</i>
            chart.zoom.fade.out :: Whether the zoomed canvas fades out or not. This also can be used to control the fade in for the zoom in thumbnail mode.<br /><i>Default: true</i>
            chart.zoom.hdir :: The horizontal direction of the zoom. Possible values are: <i>left</i>, <i>center</i>, <i>right</i><br /><i>Default: right</i>
            chart.zoom.vdir :: The vertical direction of the zoom. Possible values are: <i>up</i>, <i>center</i>, <i>down</i><br /><i>Default: down</i>
            chart.zoom.delay :: The delay (in milliseconds) between frames.<br /><i>Default: 50</i>
            chart.zoom.frames :: The number of frames in the zoom animation.<br /><i>Default: 10</i>
            chart.zoom.shadow :: Whether or not the zoomed canvas has a shadow or not.<br /><i>Default: true</i>
            chart.zoom.thumbnail.width :: When the zoom is in thumbnail mode, this is the width (in pixels) of the thumbnail.<br /><i>Default: 75</i>
            chart.zoom.thumbnail.height :: When the zoom is in thumbnail mode, this is the height (in pixels) of the thumbnail.<br /><i>Default: 75</i>
            chart.zoom.background :: Defaulting to true, this determines whether the zoom has a dark, semi-opaque background that covers the entire web page.<br /><i>Default: true</i>
        </PROPERTIES>
    -->

    <!-- DOCS -->

    <table border="0" id="docs">
        <tr>
            <th><a name="chart.background.barcolor1"></a>chart.background.barcolor1</th>
            <td>The color of the background bars, (1 of 2). <br /><i>Default: white</i></td>
            <th><a name="chart.background.barcolor2"></a>chart.background.barcolor2</th>
            <td>The color of the background bars, (2 of 2). <br /><i>Default: white</i></td>
        </tr>
        <tr>
            <th><a name="chart.background.grid"></a>chart.background.grid</th>
            <td>Whether to show the background grid or not. <br /><i>Default: true</i></td>
            <th><a name="chart.background.grid.color"></a>chart.background.grid.color</th>
            <td>The color of the background grid. <br /><i>Default: #ddd</i></td>
        </tr>
        <tr>
            <th><a name="chart.background.grid.hsize"></a>chart.background.grid.hsize</th>
            <td>The horizontal background grid size. <br /><i>Default: 40</i></td>
            <th><a name="chart.background.grid.vsize"></a>chart.background.grid.vsize</th>
            <td>The vertical background grid size. <br /><i>Default: 18</i></td>
        </tr>
        <tr>
            <th><a name="chart.background.grid.width"></a>chart.background.grid.width</th>
            <td>The width that the background grid lines are. Decimals (eg 0.5) are permitted.<br /><i>Default: 1</i></td>
            <th><a name="chart.background.hbars"></a>chart.background.hbars</th>
            <td>An array of information stipulating horizontal coloured bars. You can use these to indicate limits. Eg: <i>myBar.Set('hbars', [[75, 10, 'yellow'], [85, 15, 'red']]);</i> This would give you two bars, one red and a lower yellow bar. The units correspond to your scale, and are the starting point and the height.<br /><i>Default: null</i></td>
        </tr>
        <tr>
            <th><a name="chart.background.grid.border"></a>chart.background.grid.border</th>
            <td>Determines whether a border line is drawn around the grid.<br /><i>Default: true</i></td>
            <th><a name="chart.background.grid.hlines"></a>chart.background.grid.hlines</th>
            <td>Determines whether to draw the horizontal grid lines.<br /><i>Default: true</i></td>
        </tr>
        <tr>
            <th><a name="chart.background.grid.vlines"></a>chart.background.grid.vlines</th>
            <td>Determines whether to draw the vertical grid lines.<br /><i>Default: true</i></td>
            <th><a name="chart.strokecolor"></a>chart.strokecolor</th>
            <td>The color of the outline of the bars. <br /><i>Default: #666</i></td>
        </tr>
        <tr>
            <th><a name="chart.colors"></a>chart.colors</th>
            <td>An array of the colors of the actual bars. <br /><i>Default: An array - ['rgb(0,0,255)', '#0f0', '#00f', '#ff0', '#0ff', '#0f0']</i></td>
            <th><a name="chart.hmargin"></a>chart.hmargin</th>
            <td>The horizontal margin (in pixels) of the graph. <br /><i>Default: 5</i></td>
        </tr>
        <tr>
            <th><a name="chart.line"></a>chart.line</th>
            <td>Formerly a boolean, this now stipulates a line graph object which is to be drawn on top of the bar chart. You can see an example <a href="combine.html">here</a>.<br /><i>Default: null</i></td>
            <th><a name="chart.gutter"></a>chart.gutter</th>
            <td>The gutter of the graph. This is the area outside of the X and Y axis - where the labels go. If you're short on space for your labels, try increasing this. <br /><i>Default: 25</i></td>
        </tr>
        <tr>
            <th><a name="chart.labels"></a>chart.labels</th>
            <td>An array of the labels to be used on the graph. <br /><i>Default: An empty array</i></td>
            <th><a name="chart.xaxispos"></a>chart.xaxispos</th>
            <td>The position of the X axis. This can be <i>bottom</i> or <i>center</i>. <br /><i>Default: bottom</i></td>
        </tr>
        <tr>
            <th><a name="chart.axis.color"></a>chart.axis.color</th>
            <td>The color of the axes.<br /><i>Default: black</i></td>
            <th><a name="chart.text.color"></a>chart.text.color</th>
            <td>The color of the labels. <br /><i>Default: black</i></td>
        </tr>
        <tr>
            <th><a name="chart.text.size"></a>chart.text.size</th>
            <td>The size (in points) of the labels. <br /><i>Default: 10</i></td>
            <th><a name="chart.text.angle"></a>chart.text.angle</th>
            <td>The angle of the horizontal text labels (at the bottom of the graph). This can be one of three values - 0, 45 or 90.<br /><i>Default: 0 (Horizontal)</i></td>
        </tr>
        <tr>
            <th><a name="chart.text.font"></a>chart.text.font</th>
            <td>The font used to render the text.<br /><i>Default: Verdana</i></td>
            <th><a name="chart.ymax"></a>chart.ymax</th>
            <td>The optional maximum Y scale value. If not specified then it will be calculated.<br /><i>Default: null (It's calculated)</i></td>
        </tr>
        <tr>
            <th><a name="chart.tooltips"></a>chart.tooltips</th>
            <td>A numerically indexed array of tooltips that are shown when a bar is clicked. These can contain HTML.<br /><i>Default: An empty array</i></td>
            <th><a name="chart.grouping"></a>chart.grouping</th>
            <td>How the bars are grouped, and it should be one of: <b>grouped</b> or <b>stacked</b><br /><i>Default: grouped</i></td>
        </tr>
        <tr>
            <th><a name="chart.title"></a>chart.title</th>
            <td>The title of the graph, if any. <br /><i>Default: null</i></td>
            <th><a name="chart.title.color"></a>chart.title.color</th>
            <td>The color of the title.<br /> <i>Default: black</i></td>
        </tr>
        <tr>
            <th><a name="chart.title.vpos"></a>chart.title.vpos</th>
            <td>This allows you to completely override the vertical positioning of the title. It should be a number between 0 and 1, and is multiplied with the gutter and then used as the vertical position. It can be useful if you need to have a large gutter.<br /><i>Default: null</i></td>
            <th><a name="chart.shadow"></a>chart.shadow</th>
            <td>Whether a drop shadow is applied. <br /><i>Default: false</i></td>
        </tr>
        <tr>
            <th><a name="chart.shadow.color"></a>chart.shadow.color</th>
            <td>The color of the shadow. <br /><i>Default: #666</i></td>
            <th><a name="chart.shadow.offsetx"></a>chart.shadow.offsetx</th>
            <td>The X offset of the shadow. <br /><i>Default: 3</i></td>
        </tr>
        <tr>
            <th><a name="chart.shadow.offsety"></a>chart.shadow.offsety</th>
            <td>The Y offset of the shadow.  <br /><i>Default: 3</i></td>
            <th><a name="chart.shadow.blur"></a>chart.shadow.blur</th>
            <td>The severity of the shadow blurring effect. <br /><i>Default: 3</i></td>
        </tr>
        <tr>
            <th><a name="chart.scale.decimals"></a>chart.scale.decimals</th>
            <td>The number of decimal places to display for the Y scale.<br /><i>Default: 0</i></td>
            <th><a name="chart.key"></a>chart.key</th>
            <td>An array of key information. <br /><i>Default: [] (An empty array)</i></td>
        </tr>
        <tr>
            <th><a name="chart.key.background"></a>chart.key.background</th>
            <td>The colour of the key background. Typically white, you could set this to something like rgba(255,255,255,0.7) to allow people to see things behind it.<br /><i>Default: white</i></td>
            <th><a name="chart.key.position"></a>chart.key.position</th>
            <td>Determines the position of the key.Either <b>graph</b> (default), or <b>gutter</b>.<br /><i>Default: graph</i></td>
        </tr>
        <tr>
            <th><a name="chart.key.shadow"></a>chart.key.shadow</th>
            <td>Whether a small drop shadow is applied to the key.<br /><i>Default: false</i></td>
            <th><a name="chart.contextmenu"></a>chart.contextmenu</th>
            <td>An array of context menu items. More information on context menus is <a href="context.html">here</a>.<br /><i>Default: [] (An empty array)</i></td>
        </tr>
        <tr>
            <th><a name="chart.units.pre"></a>chart.units.pre</th>
            <td>The units that the Y axis is measured in. This string is displayed BEFORE the actual number, allowing you to specify values such as "$50".<br /><i>Default: none</i></td>
            <th><a name="chart.units.post"></a>chart.units.post</th>
            <td>The units that the Y axis is measured in. This string is displayed AFTER the actual number, allowing you to specify values such as "50ms".<br /><i>Default: none</i></td>
        </tr>
        <tr>
            <th><a name="chart.tooltip.effect"></a>chart.tooltip.effect</th>
            <td>The animated effect used for showing tooltips. Can be either <i>fade</i> or <i>expand</i>.<br /><i>Default: fade</i></td>
            <th><a name="chart.variant"></a>chart.variant</th>
            <td>This simply stipulates whether you want a regular bar chart, a dot chart, a pyramid chart a 3D chart, a sketch or a glassy chart. Possible values are:<ul><li>bar</li><li>dot</li><li>pyramid</li><li>arrow</li><li>3d</li><li>sketch</li><li>glass</li></ul>The pyramid, dot, arrow, sketch and glass variants are only effective for regular bar charts - not grouped or stacked charts.<br /><i>Default: bar</i></td>
        </tr>
        <tr>
            <th><a name="chart.crosshairs"></a>chart.crosshairs</th>
            <td>If true, you will get a crosshair centering on the current mouse position.<br /><i>Default: false</i></td>
            <th><a name="chart.crosshairs.color"></a>chart.crosshairs.color</th>
            <td>The color of the crosshairs.<br /><i>Default: #333</i></td>
        </tr>
        <tr>
            <th><a name="chart.annotatable"></a>chart.annotatable</th>
            <td>Whether annotations are enabled for the chart (ie you can draw on the chart interactively.<br /><i>Default: false</i></td>
            <th><a name="chart.annotate.color"></a>chart.annotate.color</th>
            <td>If you do not allow the use of the palette, then this will be the only colour allowed for annotations.<br /><i>Default: black</i></td>
        </tr>
        <tr>
            <th><a name="chart.labels.above"></a>chart.labels.above</th>
            <td>If true, values will be shown above the bars. For regular and stacked bar charts units are included, whereas for grouped bar charts they're not (usually there isn't enough space for them).<br /><i>Default: false</i></td>
            <th><a name="chart.ylabels"></a>chart.ylabels</th>
            <td>Can be <i>true</i> or <i>false</i> and determines whether the chart has Y axis labels.<br /><i>Default: true</i></td>
        </tr>
        <tr>
            <th><a name="chart.ylabels.count"></a>chart.ylabels.count</th>
            <td>A value (<i>1, 3 or 5</i>) that controls how many Y labels there are. <br /><i>Default: 5</i></td>
            <th><a name="chart.zoom.mode"></a>chart.zoom.mode</th>
            <td>Can be used to control whether the zoom is in thumbnail or canvas mode. Possible values are: <i>thumbnail</i> and <i>canvas</i>.<br /><i>Default: canvas</i></td>
        </tr>
        <tr>
            <th><a name="chart.zoom.factor"></a>chart.zoom.factor</th>
            <td>This is the factor that the graph will be zoomed by (bigger values means more zoom)<br /><i>Default: 1.5</i></td>
            <th><a name="chart.zoom.fade.in"></a>chart.zoom.fade.in</th>
            <td>Whether the zoomed canvas fades in or not. This also can be used to control the fade in for the zoom in thumbnail mode.<br /><i>Default: true</i></td>
        </tr>
        <tr>
            <th><a name="chart.zoom.fade.out"></a>chart.zoom.fade.out</th>
            <td>Whether the zoomed canvas fades out or not. This also can be used to control the fade in for the zoom in thumbnail mode.<br /><i>Default: true</i></td>
            <th><a name="chart.zoom.hdir"></a>chart.zoom.hdir</th>
            <td>The horizontal direction of the zoom. Possible values are: <i>left</i>, <i>center</i>, <i>right</i><br /><i>Default: right</i></td>
        </tr>
        <tr>
            <th><a name="chart.zoom.vdir"></a>chart.zoom.vdir</th>
            <td>The vertical direction of the zoom. Possible values are: <i>up</i>, <i>center</i>, <i>down</i><br /><i>Default: down</i></td>
            <th><a name="chart.zoom.delay"></a>chart.zoom.delay</th>
            <td>The delay (in milliseconds) between frames.<br /><i>Default: 50</i></td>
        </tr>
        <tr>
            <th><a name="chart.zoom.frames"></a>chart.zoom.frames</th>
            <td>The number of frames in the zoom animation.<br /><i>Default: 10</i></td>
            <th><a name="chart.zoom.shadow"></a>chart.zoom.shadow</th>
            <td>Whether or not the zoomed canvas has a shadow or not.<br /><i>Default: true</i></td>
        </tr>
        <tr>
            <th><a name="chart.zoom.thumbnail.width"></a>chart.zoom.thumbnail.width</th>
            <td>When the zoom is in thumbnail mode, this is the width (in pixels) of the thumbnail.<br /><i>Default: 75</i></td>
            <th><a name="chart.zoom.thumbnail.height"></a>chart.zoom.thumbnail.height</th>
            <td>When the zoom is in thumbnail mode, this is the height (in pixels) of the thumbnail.<br /><i>Default: 75</i></td>
        </tr>
        <tr>
            <th><a name="chart.zoom.background"></a>chart.zoom.background</th>
            <td>Defaulting to true, this determines whether the zoom has a dark, semi-opaque background that covers the entire web page.<br /><i>Default: true</i></td>
        </tr>
    </table><br /><br />

    

    

    

    

    

    

    

    

    

    

    

    

    

    

    

    

    

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